Polk County Sheriff Dwaine W. Ladwig PO Box 567 Osceola, NE 68651 Phone – (402) 747-2231 Fax – (402) 747-5981 The Polk County Sheriff’s Office is located at 251 North Main Street. Functions of the Sheriff It is the duty of the sheriff to serve, execute and return writs or other legal process issued by a lawful authority. The sheriff shall prepare and file an annual inventory statement of county personal property in his or her custody. The sheriff has charge and custody of the jail and its prisoners. It is the duty of the sheriff to keep the peace, apprehend criminals and perform other duties as peace officer.